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the cost to the taxpayer of any common shares of any class of the capital stock of the corporation receivable by the taxpayer as consideration for the disposition shall be deemed to be that proportion of the amount, if any, by which the proceeds of the disposition exceed the total of the fair market value, at the time of the disposition, of the consideration (other than shares of the capital stock of the corporation or a right to receive any such shares) received by the taxpayer for the disposition and the cost to the taxpayer of all preferred shares of the capital stock of the corporation receivable by the taxpayer as consideration for the disposition, that